systemd-stable/extras/volume_id/vol_id.8

.\"     Title: vol_id
.\"    Author: 
.\" Generator: DocBook XSL Stylesheets v1.70.1 <http://docbook.sf.net/>
.\"      Date: March 2006
.\"    Manual: vol_id
.\"    Source: volume_id
.\"
.TH "VOL_ID" "8" "March 2006" "volume_id" "vol_id"
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.nh
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.SH "NAME"
vol_id \- probe filesystem type and read label and uuid
.SH "SYNOPSIS"
.HP 7
\fBvol_id\fR [\fB\-\-export\fR] [\fB\-t\fR] [\fB\-l\fR] [\fB\-u\fR] [\fIdevice\fR]
.SH "DESCRIPTION"
.PP
\fBvol_id\fR
is usually called from a udev rule, to provide udev with the filesystem type, the label and the uuid of a volume.
\fBvol_id\fR
supports all common filesystem formats and detects various raid setups to prevent the recognition of raid members as a volume with a filesystem.
.SH "OPTIONS"
.TP 3n
\fB\-\-export\fR
print all values in key/value format to import them into the environment.
.TP 3n
\fB\-t\fR
print the filesystem type
.TP 3n
\fB\-l\fR
print the label of a volume
.TP 3n
\fB\-u\fR
print the uuid of a volume
.SH "ENVIRONMENT"
.TP 3n
\fBUDEV_LOG\fR
Set the syslog priority.
.SH "EXIT STATUS"
.PP
\fBvol_id\fR
will only return successful if the value asked for is not empty. All trailing whitespace will be removed, spaces replaced by underscore and slashes ignored.
.SH "AUTHOR"
.PP
Written by Kay Sievers
<kay.sievers@vrfy.org>
.SH "SEE ALSO"
.PP
\fBudev\fR(7)